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authorSteven Whitehouse <swhiteho@redhat.com>2008-09-18 08:49:32 -0400
committerSteven Whitehouse <swhiteho@redhat.com>2008-09-18 08:49:32 -0400
commit37ec89e83c4ca98323fe74f139301ff3949cfdb6 (patch)
tree5bb249dcfdc38f06ef1d363f099f9f88e23043e7 /fs/gfs2/incore.h
parentacd2c8aa02f302ed838348052e16ee575c645147 (diff)
GFS2: The war on bloat
The following patch shrinks the gfs2_args structure which is embedded in every GFS2 superblock. It cuts down the size of the options to a single unsigned int (the 13 bits of bitfields will be rounded up to that size by the compiler) from the current 11 unsigned ints. So on x86 thats 44 bytes shrinking to 4 bytes, in each and every GFS2 superblock. Signed-off-by: Steven Whitehouse <swhitho@redhat.com>
Diffstat (limited to 'fs/gfs2/incore.h')
-rw-r--r--fs/gfs2/incore.h30
1 files changed, 15 insertions, 15 deletions
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index a1777a1927b3..b2c5784092cf 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -386,21 +386,21 @@ struct gfs2_statfs_change_host {
386#define GFS2_DATA_ORDERED 2 386#define GFS2_DATA_ORDERED 2
387 387
388struct gfs2_args { 388struct gfs2_args {
389 char ar_lockproto[GFS2_LOCKNAME_LEN]; /* Name of the Lock Protocol */ 389 char ar_lockproto[GFS2_LOCKNAME_LEN]; /* Name of the Lock Protocol */
390 char ar_locktable[GFS2_LOCKNAME_LEN]; /* Name of the Lock Table */ 390 char ar_locktable[GFS2_LOCKNAME_LEN]; /* Name of the Lock Table */
391 char ar_hostdata[GFS2_LOCKNAME_LEN]; /* Host specific data */ 391 char ar_hostdata[GFS2_LOCKNAME_LEN]; /* Host specific data */
392 int ar_spectator; /* Don't get a journal because we're always RO */ 392 unsigned int ar_spectator:1; /* Don't get a journal */
393 int ar_ignore_local_fs; /* Don't optimize even if local_fs is 1 */ 393 unsigned int ar_ignore_local_fs:1; /* Ignore optimisations */
394 int ar_localflocks; /* Let the VFS do flock|fcntl locks for us */ 394 unsigned int ar_localflocks:1; /* Let the VFS do flock|fcntl */
395 int ar_localcaching; /* Local-style caching (dangerous on multihost) */ 395 unsigned int ar_localcaching:1; /* Local caching */
396 int ar_debug; /* Oops on errors instead of trying to be graceful */ 396 unsigned int ar_debug:1; /* Oops on errors */
397 int ar_upgrade; /* Upgrade ondisk/multihost format */ 397 unsigned int ar_upgrade:1; /* Upgrade ondisk format */
398 unsigned int ar_num_glockd; /* Number of glockd threads */ 398 unsigned int ar_posix_acl:1; /* Enable posix acls */
399 int ar_posix_acl; /* Enable posix acls */ 399 unsigned int ar_quota:2; /* off/account/on */
400 int ar_quota; /* off/account/on */ 400 unsigned int ar_suiddir:1; /* suiddir support */
401 int ar_suiddir; /* suiddir support */ 401 unsigned int ar_data:2; /* ordered/writeback */
402 int ar_data; /* ordered/writeback */ 402 unsigned int ar_meta:1; /* mount metafs */
403 int ar_meta; /* mount metafs */ 403 unsigned int ar_num_glockd; /* Number of glockd threads */
404}; 404};
405 405
406struct gfs2_tune { 406struct gfs2_tune {